Fructose is a type of sugar that is found in many fruits and vegetables. It is also known as fruit sugar because it is naturally occurring in fruits like apples, oranges, and berries. Fructose is sweeter than table sugar (sucrose) and has a slightly different chemical composition, which makes it easier for the body to metabolize. However, consuming too much fructose can lead to health problems such as obesity, diabetes, and high blood pressure.